CN107598273B - Under-mud cutting device and method for dismantling marine abandoned oil well platform pipe - Google Patents
Under-mud cutting device and method for dismantling marine abandoned oil well platform pipe Download PDFInfo
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- CN107598273B CN107598273B CN201710801974.3A CN201710801974A CN107598273B CN 107598273 B CN107598273 B CN 107598273B CN 201710801974 A CN201710801974 A CN 201710801974A CN 107598273 B CN107598273 B CN 107598273B
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- 238000005520 cutting process Methods 0.000 title claims abstract description 133
- 239000003129 oil well Substances 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 11
- 230000007246 mechanism Effects 0.000 claims abstract description 104
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 43
- 239000010959 steel Substances 0.000 claims abstract description 43
- 230000001681 protective effect Effects 0.000 claims abstract description 31
- 229910003460 diamond Inorganic materials 0.000 claims abstract description 29
- 239000010432 diamond Substances 0.000 claims abstract description 29
- 238000003825 pressing Methods 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 6
- 230000008878 coupling Effects 0.000 claims description 5
- 238000010168 coupling process Methods 0.000 claims description 5
- 238000005859 coupling reaction Methods 0.000 claims description 5
- 239000011324 bead Substances 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000002699 waste material Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000004880 explosion Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
- Y02A20/204—Keeping clear the surface of open water from oil spills
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- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
Abstract
The invention discloses a mud cutting device and a method for dismantling an ocean abandoned oil well platform pipe, wherein the device comprises a protective cover, a cutting feeding mechanism, a diamond chain cutting mechanism, a locking mechanism and a mounting frame, wherein the protective cover is arranged outside a steel pipe to be cut, and a heave guide rail is arranged on the inner wall of the protective cover; the cutting feeding mechanism and the diamond chain cutting mechanism are arranged on the mounting frame; the lower part of the mounting frame is provided with a locating pin, and the locking mechanism is provided with a locating hole; the locking mechanism slides along the sinking guide rail, and after sinking to a specified depth along the steel pipe to be cut, the positioning oil cylinder is started to hold the steel pipe to be cut tightly; then the mounting frame is lowered along the heave guide rail, the positioning pin is inserted into the positioning hole, and the mounting frame is fixed on the locking mechanism by the locking oil cylinder; and starting a feeding mechanism to tightly attach the diamond chain to the steel pipe to be cut, starting a hydraulic power source, and starting cutting, wherein the cutting speed and the cutting depth are controlled by the feeding mechanism during cutting. The invention cuts and dismantles the abandoned oil well platform pipe safely, rapidly and effectively, and has the characteristics of economy and environmental protection.
Description
Technical Field
The invention relates to the field of offshore oil well platform pipe under-mud dismantling and cutting, in particular to an under-mud cutting device and method for dismantling an offshore waste oil well platform pipe, and a device for cutting a steel pipe under water or mud during the under-mud cutting operation of the offshore oil well platform pipe.
Background
At present, along with long-term collection of offshore oil and gas field resources in China, the offshore oil and gas field resources are increasingly exhausted, and a large number of waste oil and gas pipes and protection piles are required to be removed. In order to ensure the safety and environmental protection of the offshore channel, the waste oil extraction platform support pipe pile is required to be cut and removed at a position which is not less than 4m below the natural mud surface in water, and spark cannot be generated during cutting. According to the requirements, after the working surface reaches the designated depth, the method of hydraulic grinding wheel cutting of divers is adopted in common practice, but the conditions of long time consumption, high risk, high manufacturing cost and the like exist, and the method is generally adopted in emergency rescue. Because a proper method cannot be found, most of the waste oil gas pipes and the protection piles cannot be cut and removed at present, and the conditions of high maintenance cost, high risk, insufficient offshore sea surface utilization and the like exist.
Disclosure of Invention
Aiming at the defects in the background technology, the invention provides the under-mud cutting device and the under-mud cutting method for dismantling the marine abandoned oil well platform pipe.
In order to achieve the above object, the present invention is realized according to the following technical scheme:
the under-mud cutting device for dismantling the marine abandoned oil well platform pipe is characterized by comprising a protective cover, a cutting and feeding mechanism, a diamond chain cutting mechanism, a locking mechanism and a mounting frame, wherein the protective cover is arranged outside a steel pipe to be cut, and a heave guide rail is arranged on the inner side of the protective cover; the locking mechanism is provided with a positioning hole; the cutting feeding mechanism and the diamond chain cutting mechanism are arranged on the mounting frame, a positioning pin is arranged at the lower part of the mounting frame, and the positioning pin is inserted into a positioning hole on the locking mechanism to realize the relative positioning with the locking mechanism; the locking mechanism and the mounting frame slide up and down along the protective cover through the heave guide rail.
In the technical scheme, the mounting frame is provided with two arms which are respectively positioned at two sides of the steel pipe to be cut; the cutting and feeding mechanism comprises a stepping motor, a driving gear, a driven gear, a screw rod, a feeding guide rail, a sliding block, a coupler and a bearing seat; the feeding guide rail is symmetrically arranged on the two arms of the mounting frame, a screw rod is arranged in the middle of the feeding guide rail, a sliding block is arranged on the screw rod, and the sliding block can move forwards and backwards along the feeding guide rail according to the rotating direction of the screw rod; the step motor is arranged at the rear part of the mounting frame, the two sides of the step motor are respectively provided with a shaft coupling, and the step motor drives the driving gear to rotate through the shaft couplings at the two sides; the driven gear is connected with the screw rod, and the driving gear drives the driven gear to rotate, so that the screw rod is driven to rotate; the bearing seat is arranged on the mounting frame and used for supporting the coupler; the cutting and feeding mechanism can realize the symmetrical advancing or retreating of the sliding blocks at two sides of the steel pipe to be cut along the feeding guide rail through the control of the stepping motor.
In the above technical scheme, two locking pin holes are respectively arranged below the two arms of the mounting frame and are used for being fixed relative to the locking mechanism.
In the technical scheme, the diamond chain cutting mechanism comprises a hydraulic motor, a cutting chain, a driving wheel and a pressing wheel; the driving wheel is arranged on the sliding block and positioned outside the feeding guide rail; a hydraulic motor is arranged below the driving wheel; the cutter link is arranged on the driving wheel; the pressing wheel is arranged on the sliding block and is positioned outside the cutting chain; the hydraulic motor drives the driving wheel to rotate, the driving wheel drives the cutting chain to start rotating, and meanwhile the pressing wheel presses the cutting chain.
In the technical scheme, the locking mechanism comprises two locking arms, two positioning cylinders, two locking cylinders and wedge blocks, wherein the two locking arms are respectively positioned at two sides of a steel pipe to be cut, the positioning cylinders are arranged between the locking arms and drive the locking arms to hold or release the steel pipe to be cut; the two locking cylinders are respectively arranged below the locking arms, the locking cylinders drive the wedge blocks and are inserted into the locking pin holes below the mounting frame to fix the mounting frame on the locking mechanism.
In the technical scheme, the protection cover is connected by two semicircular steel pipe bolts or buckles, and the diameter of the protection cover is determined according to the diameter of the steel pipe to be cut.
In the above technical scheme, wedge locating pin is installed to the mounting bracket lower part, be provided with the locating hole on the locking mechanism, the locating pin inserts the locating hole for the location of diamond chain cutting mechanism.
In the technical scheme, the cutting chain is a diamond string bead rope.
In the above technical scheme, the driving gear and the driven gear are bevel gears.
The invention also provides a method for cutting under mud for dismantling the marine abandoned oil well platform pipe by using the cutting device, which comprises the following steps:
step S1: installing a protective cover outside the steel pipe to be cut, and operating all the cutting devices inside the protective cover;
step S2: the protective cover is provided with a heave guide rail along the depth direction, the protective cover is connected in sections in the depth direction and lengthened, and each mechanism slides along the heave guide rail to move and position the steel pipe to be cut;
step S3: the locking mechanism is lowered along the heave guide rail, after reaching a specified depth, the positioning oil cylinder is started to drive the locking arm, and when the positioning oil cylinder is retracted, the locking arm holds the steel pipe to be cut tightly, so that locking is realized; when the positioning oil cylinder stretches out, the locking arm is loosened;
step S4: setting a cutting feeding mechanism and a diamond chain cutting mechanism, and mounting the cutting feeding mechanism and the diamond chain cutting mechanism on a mounting frame;
step S5: the installation frame is lowered along the heave guide rail until the positioning pin is inserted into the positioning hole, the locking oil cylinder is started to drive the wedge block, and when the locking oil cylinder stretches out, the wedge block is inserted into the locking pin hole, so that the installation frame and the locking mechanism are relatively fixed; when the locking oil cylinder is retracted, the wedge blocks exit the locking pin holes, so that the mounting frame is separated from the locking mechanism;
step S6: the cutting and feeding mechanism drives a screw rod by a stepping motor to drive a sliding block to advance or retreat along a feeding guide rail so as to realize cutting and feeding; when cutting and feeding, a stepping motor is started to drive a coupler and a driving gear to rotate, a driven gear drives a screw rod to rotate, and a sliding block symmetrically feeds along a feeding guide rail; when the cutting is withdrawn, the stepping motor is reversely started, and the sliding block reversely withdraws;
step S7: the hydraulic motor drives the diamond chain cutting mechanism, the driving wheel drives the cutting chain to rotate, the steel pipe to be cut is cut, and the pinch roller compresses the cutting chain.
Compared with the prior art, the invention has the following beneficial effects:
the cutting device provided by the invention sinks to a specified depth along a pipe to be cut, and is locked by the oil cylinder, so that the steel pipe is cut by the diamond chain. The protection cover ensures that the cutting process is not influenced by water flow and back siltation. The invention provides a device for cutting a steel pipe under water or mud, which is used for controlling on water, does not use divers for underwater operation, and reduces the risk of underwater operation; the cutting process has small disturbance, no spark and little pollution to the sea, and avoids the danger of oil gas explosion; the cutting cost is low, the time consumption is short, and good economic benefit is achieved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained from these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a top view of the feed mechanism of the under mud cutting apparatus of the present invention;
FIG. 2 is a top view of the under mud cutting apparatus of the present invention;
FIG. 3 is an elevation view of the under mud cutting apparatus of the present invention;
FIG. 4 is a top view of the locking device of the present invention;
fig. 5 is an elevation view of the locking device and mounting bracket relative to the securing mechanism of the present invention.
In the figure, the steel pipe to be cut is 1-, the protective cover is 2-, the stepping motor is 3-, the driving gear is 4-, the driven gear is 5-, the lead screw is 6-, the feeding guide rail is 7-, the sliding block is 8-, the coupling is 9-, the bearing seat is 10-, the mounting frame is 11-, the locking pin hole is 12-, the cutting chain is 13-, the driving wheel is 14-, the pressing wheel is 15-, the hydraulic motor is 16-, the locating pin is 17-, the locking arm is 18-, the locating cylinder is 19-, the locating hole is 20-, the sinking guide rail is 21-, the locking cylinder is 22-and the wedge is 23-.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention.
The invention discloses a mud cutting device for dismantling an ocean abandoned oil well platform pipe, which comprises a protective cover 2, a cutting and feeding mechanism, a diamond chain cutting mechanism, a locking mechanism and a mounting frame 11, wherein the protective cover 2 is arranged outside a steel pipe 1 to be cut, and a heave guide rail 21 is arranged on the inner side of the protective cover 2; the locking mechanism is provided with a positioning hole 20; the cutting feeding mechanism and the diamond chain cutting mechanism are arranged on the mounting frame, a positioning pin 17 is arranged below the mounting frame 11, and the positioning pin 17 is inserted into a positioning hole 20 on the locking mechanism to realize the relative positioning with the locking mechanism; the locking mechanism and the mounting frame 11 slide up and down along the protective cover 2 through the heave guide rail 21. The protection cover 2 is connected by two semicircular steel pipe bolts or buckles, and the diameter of the protection cover 2 is determined according to the diameter of the steel pipe to be cut. The protective cover 2 can be lengthened in sections in depth.
The cutting feed mechanism, the diamond chain cutting mechanism and the locking mechanism are described below with reference to the accompanying drawings.
Fig. 1 shows a top view of the feeding mechanism of the under mud cutting device of the present invention. Referring to fig. 1, a protective cover 2 is installed outside a steel pipe 1 to be cut, and a heave rail 21 is installed on the inner wall of the protective cover 2. The mounting frame 11 is provided with two arms which are respectively positioned at two sides of the steel pipe to be cut. The cutting and feeding mechanism comprises a stepping motor 3, a driving gear 4, a driven gear 5, a screw rod 6, a feeding guide rail 7, a sliding block 8, a coupler 9 and a bearing seat 10. The cutting feed mechanism is mounted on a mounting frame 11. The feed guide rail 7 is symmetrically arranged on two arms of the mounting frame 11, a screw rod 6 is arranged in the middle of the feed guide rail 7, a sliding block 8 is arranged on the screw rod 6, and the sliding block 8 realizes the forward and backward movement along the feed guide rail 7 according to the rotation direction of the screw rod 6; the stepping motor 3 is arranged at the rear part of the mounting frame 11, the two sides of the stepping motor are respectively provided with a coupler 9, and the stepping motor 3 drives the driving gear 4 to rotate through the couplers at the two sides; the driven gear 5 is connected with the screw rod 6, and the driving gear 4 drives the driven gear 5 to rotate, so that the screw rod 6 is driven to rotate; the bearing seat 10 is arranged on the mounting frame 11 and supports the coupler 9; the cutting and feeding mechanism realizes the symmetrical advance or retreat of the sliding blocks 8 at the two sides of the steel pipe 1 to be cut along the feeding guide rail 7 by the control of the stepping motor 3.
Wherein, the driving gear 4 and the driven gear 5 in the invention both adopt bevel gear structures.
When cutting and feeding, the stepping motor 3 is started to drive the coupler 9 and the driving gear 4 to rotate, the driving gear 4 drives the driven gear 5 to rotate, the driven gear 5 drives the screw rod 6 to rotate, and the sliding blocks 8 symmetrically feed along the feed guide rail 7. When the cutting is withdrawn, the stepping motor 3 is reversely started, and the sliding block 8 is reversely retracted.
Fig. 2 shows a top view of the under-mud cutting mechanism of the present invention, and fig. 3 shows an elevation view of the under-mud cutting mechanism. Referring to fig. 2 and 3, the diamond chain cutting mechanism includes a hydraulic motor 16, a cutting chain 13, a driving wheel 14, and a pinch roller 15. The driving wheel 14 is arranged on the sliding block 8 and is positioned at the outer side of the feeding guide rail 7, the hydraulic motor 16 is arranged below the driving wheel 14, the cutting chain 13 is arranged on the driving wheel 14 in a circumferential direction, the pinch roller 15 is arranged outside the annular cutting chain 13, the hydraulic motor 16 drives the driving wheel 14 to rotate, the driving wheel 14 drives the cutting chain 13 to start rotating, and meanwhile, the cutting chain is pressed by the pinch roller 15.
During cutting operation, the hydraulic motor 16 is started to drive the driving wheel 14 to rotate, the cutting chain 13 starts to rotate, and the pressing wheel 15 presses the cutting chain 13. The cutting chain 13 is pressed against the steel pipe 1 to be cut and starts the cutting operation. When puck 15 wears significantly, puck 15 may not be installed.
In the invention, the wedge-shaped locating pin 17 is arranged at the lower part of the mounting frame, and the wedge-shaped locating pin 17 is inserted into the locating hole 20 for the relative positioning of the mounting frame and the locking mechanism; the lower part of the mounting frame is provided with a locking pin hole 12, two arms of the locking mechanism are provided with a locking oil cylinder 22 and a wedge block 23, and the locking oil cylinder 22 stretches out to drive the wedge block 23 to be inserted into the locking pin hole 12 for the relative fixation of the mounting frame and the locking mechanism.
The cutting chain adopts diamond bead strings in the invention.
Fig. 4 shows a top view of the locking device of the present invention. Referring to fig. 4, the locking mechanism includes locking arms 18, positioning cylinders 19, locking cylinders 22, wedges 23, and positioning cylinders 19 are installed between the locking arms 18. When the positioning oil cylinder 19 is retracted, the locking arm 18 holds the steel pipe 1 to be cut tightly, so that locking is realized; when the positioning cylinder 19 is extended, the locking arm 18 is released. Referring to fig. 4, the mounting frame 10 has a positioning hole 20; referring to fig. 3, a positioning pin 17 is provided under the mounting frame 11, and the cutting device is fixed in position when the positioning pin 17 is inserted into the positioning hole 20.
Figure 5 shows an elevation view of the mechanism of the present invention in relative fixation between the locking mechanism and the mounting bracket. Referring to fig. 5, a locking pin hole 12 is formed under the mounting frame 11; the locking mechanism is provided with a locking cylinder 22 and a wedge block 23. When the locking cylinder 22 extends out, the wedge block 23 is inserted into the locking pin hole 12, and the locking mechanism and the mounting frame 11 are relatively fixed; when the lock cylinder 22 is retracted, the wedge 23 is withdrawn from the lock pin hole 12 and the lock mechanism is separated from the mounting bracket 11.
The invention also provides a method for cutting under mud for dismantling the marine abandoned oil well platform pipe according to the device, which comprises the following steps:
step S1: installing a protective cover outside the steel pipe to be cut, and operating all the cutting devices inside the protective cover;
step S2: the protective cover is provided with a heave guide rail along the depth direction, the protective cover is connected in sections in the depth direction and lengthened, and each mechanism slides along the heave guide rail to move and position the steel pipe to be cut;
step S3: the locking mechanism is lowered along the heave guide rail, after reaching a specified depth, the positioning oil cylinder is started to drive the locking arm, and when the positioning oil cylinder is retracted, the locking arm holds the steel pipe to be cut tightly, so that locking is realized; when the positioning oil cylinder stretches out, the locking arm is loosened;
step S4: setting a cutting feeding mechanism and a diamond chain cutting mechanism, and mounting the cutting feeding mechanism and the diamond chain cutting mechanism on a mounting frame;
step S5: the installation frame is lowered along the heave guide rail until the positioning pin is inserted into the positioning hole, the locking oil cylinder is started to drive the wedge block, and when the locking oil cylinder stretches out, the wedge block is inserted into the locking pin hole, so that the installation frame and the locking mechanism are relatively fixed; when the locking oil cylinder is retracted, the wedge blocks exit the locking pin holes, so that the mounting frame is separated from the locking mechanism;
step S6: the cutting and feeding mechanism drives a screw rod by a stepping motor to drive a sliding block to advance or retreat along a feeding guide rail so as to realize cutting and feeding; when cutting and feeding, a stepping motor is started to drive a coupler and a driving gear to rotate, a driven gear drives a screw rod to rotate, and a sliding block symmetrically feeds along a feeding guide rail; when the cutting is withdrawn, the stepping motor is reversely started, and the sliding block reversely withdraws;
step S7: the hydraulic motor drives the diamond chain cutting mechanism, the driving wheel drives the cutting chain to rotate, the steel pipe to be cut is cut, and the pinch roller compresses the cutting chain.
According to the technical scheme, the cutting device is enabled to sink to the designated depth along the pipe to be cut, the steel pipe is cut by the diamond chain through locking of the oil cylinder, water control is carried out, underwater operation of a diver is not used, and underwater operation risks are reduced; the cutting process has small disturbance, no spark and little pollution to the sea, and avoids the danger of oil gas explosion; the cutting cost is low, the time consumption is short, and good economic benefit is achieved.
The above description of the practice of the invention has been presented. It is to be understood that the invention is not limited to the particular embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the claims without affecting the spirit of the invention. The selection of each parameter in the invention is determined according to the specific condition of the work object.
Claims (7)
1. The under-mud cutting device for dismantling the marine abandoned oil well platform pipe is characterized by comprising a protective cover, a cutting and feeding mechanism, a diamond chain cutting mechanism, a locking mechanism and a mounting frame, wherein the protective cover is arranged outside a steel pipe to be cut, and a heave guide rail is arranged on the inner side of the protective cover; the locking mechanism is provided with a positioning hole; the cutting feeding mechanism and the diamond chain cutting mechanism are arranged on the mounting frame, a positioning pin is arranged at the lower part of the mounting frame, and the positioning pin is inserted into a positioning hole on the locking mechanism to realize the relative positioning with the locking mechanism; the locking mechanism and the mounting frame slide up and down along the protective cover through the heave guide rail; the mounting frame is provided with two arms which are respectively positioned at two sides of the steel pipe to be cut; the cutting and feeding mechanism comprises a stepping motor, a driving gear, a driven gear, a screw rod, a feeding guide rail, a sliding block, a coupler and a bearing seat; the feeding guide rail is symmetrically arranged on the two arms of the mounting frame, a screw rod is arranged in the middle of the feeding guide rail, a sliding block is arranged on the screw rod, and the sliding block can move forwards and backwards along the feeding guide rail according to the rotating direction of the screw rod; the step motor is arranged at the rear part of the mounting frame, the two sides of the step motor are respectively provided with a shaft coupling, and the step motor drives the driving gear to rotate through the shaft couplings at the two sides; the driven gear is connected with the screw rod, and the driving gear drives the driven gear to rotate, so that the screw rod is driven to rotate; the bearing seat is arranged on the mounting frame and used for supporting the coupler; the cutting and feeding mechanism can realize the symmetrical advancing or retreating of the sliding blocks at two sides of the steel pipe to be cut along the feeding guide rail through the control of the stepping motor;
the diamond chain cutting mechanism comprises a hydraulic motor, a cutting chain, a driving wheel and a pinch roller; the driving wheel is arranged on the sliding block and positioned outside the feeding guide rail; a hydraulic motor is arranged below the driving wheel; the cutter link is arranged on the driving wheel; the pressing wheel is arranged on the sliding block and is positioned outside the cutting chain; the hydraulic motor drives the driving wheel to rotate, the driving wheel drives the cutting chain to start rotating, and the pressing wheel presses the cutting chain;
the locking mechanism comprises two locking arms, two positioning cylinders, two locking cylinders and wedge blocks, wherein the two locking arms are respectively positioned at two sides of a steel pipe to be cut, the positioning cylinders are arranged between the locking arms, and the positioning cylinders drive the locking arms to tightly hold or loosen the steel pipe to be cut; the two locking cylinders are respectively arranged below the locking arms, the locking cylinders drive the wedge blocks and are inserted into the locking pin holes below the mounting frame to fix the mounting frame on the locking mechanism.
2. A sub-mud cutting apparatus for marine abandoned oil well platform pipe removal as claimed in claim 1, wherein: two locking pin holes are respectively arranged below the two arms of the mounting frame and are used for being fixed relative to the locking mechanism.
3. A sub-mud cutting apparatus for marine abandoned oil well platform pipe removal as claimed in claim 1, wherein: the protection cover is connected by two semicircular steel pipe bolts or buckles, and the diameter of the protection cover is determined according to the diameter of the steel pipe to be cut.
4. A sub-mud cutting apparatus for marine abandoned oil well platform pipe removal as claimed in claim 2, wherein: the locating pin comprises a wedge-shaped locating pin, and a locating hole is formed in the locking mechanism, and the locating pin is inserted into the locating hole and used for locating the diamond chain cutting mechanism.
5. A sub-mud cutting apparatus for marine abandoned oil well platform pipe removal as claimed in claim 1, wherein: the cutting chain is a diamond string bead rope.
6. A sub-mud cutting apparatus for marine abandoned oil well platform pipe removal as claimed in claim 1, wherein: the driving gear and the driven gear are bevel gears.
7. A method of cutting with an under mud cutting apparatus as claimed in any one of claims 1 to 6, comprising the steps of:
step S1: installing a protective cover outside the steel pipe to be cut, and operating all the cutting devices inside the protective cover;
step S2: the protective cover is provided with a heave guide rail along the depth direction, the protective cover is connected in sections in the depth direction and lengthened, and each mechanism slides along the heave guide rail to move and position the steel pipe to be cut;
step S3: the locking mechanism is lowered along the heave guide rail, after reaching a specified depth, the positioning oil cylinder is started to drive the locking arm, and when the positioning oil cylinder is retracted, the locking arm holds the steel pipe to be cut tightly, so that locking is realized; when the positioning oil cylinder stretches out, the locking arm is loosened;
step S4: setting a cutting feeding mechanism and a diamond chain cutting mechanism, and mounting the cutting feeding mechanism and the diamond chain cutting mechanism on a mounting frame;
step S5: the installation frame is lowered along the heave guide rail until the positioning pin is inserted into the positioning hole, the locking oil cylinder is started to drive the wedge block, and when the locking oil cylinder stretches out, the wedge block is inserted into the locking pin hole, so that the installation frame and the locking mechanism are relatively fixed; when the locking oil cylinder is retracted, the wedge blocks exit the locking pin holes, so that the mounting frame is separated from the locking mechanism;
step S6: the cutting and feeding mechanism drives a screw rod by a stepping motor to drive a sliding block to advance or retreat along a feeding guide rail so as to realize cutting and feeding; when cutting and feeding, a stepping motor is started to drive a coupler and a driving gear to rotate, a driven gear drives a screw rod to rotate, and a sliding block symmetrically feeds along a feeding guide rail; when the cutting is withdrawn, the stepping motor is reversely started, and the sliding block reversely withdraws;
step S7: the hydraulic motor drives the diamond chain cutting mechanism, the driving wheel drives the cutting chain to rotate, the steel pipe to be cut is cut, and the pinch roller compresses the cutting chain.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710801974.3A CN107598273B (en) | 2017-09-07 | 2017-09-07 | Under-mud cutting device and method for dismantling marine abandoned oil well platform pipe |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710801974.3A CN107598273B (en) | 2017-09-07 | 2017-09-07 | Under-mud cutting device and method for dismantling marine abandoned oil well platform pipe |
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| CN107598273A CN107598273A (en) | 2018-01-19 |
| CN107598273B true CN107598273B (en) | 2024-03-15 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108277804A (en) * | 2018-01-31 | 2018-07-13 | 上海交大海科检测技术有限公司 | The sinking positioning device and method cut with Yu Haiyang abandoned well platform pipe |
| CN110863491B (en) * | 2019-11-05 | 2021-05-28 | 哈尔滨工程大学 | Device and method for blowing mud of abandoned submarine pile pipe downwards and cutting mud |
| CN116060699B (en) * | 2023-03-15 | 2023-06-27 | 山东海盛海洋工程集团有限公司 | Under-mud cutting device and method for submarine metal waste |
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| CN101468440A (en) * | 2007-12-24 | 2009-07-01 | 中国海洋石油总公司 | Clamping device of underwater diamond rope saw |
| CN101612683A (en) * | 2009-07-17 | 2009-12-30 | 哈尔滨工程大学 | Underwater horizontal type diamond-wire saw |
| CN101758284A (en) * | 2009-09-30 | 2010-06-30 | 天津市海王星海上工程技术有限公司 | Steel pipe vertical seam cutting machine device |
| CN102229009A (en) * | 2011-04-14 | 2011-11-02 | 哈尔滨工程大学 | Variable structure adaptive feed type rope saw |
| CN102343345A (en) * | 2011-10-11 | 2012-02-08 | 中国海洋石油总公司 | Self-clamping full-rotating cleaning device for coating of high pressure water pipeline |
| CN103101117A (en) * | 2013-01-15 | 2013-05-15 | 哈尔滨工程大学 | Tube sawing machine rotary cutting tool changing mechanism |
| CN104676191A (en) * | 2015-01-30 | 2015-06-03 | 哈尔滨工程大学 | Submarine pipeline clamp repairing connector |
| CN105562818A (en) * | 2016-02-27 | 2016-05-11 | 河北工业大学 | Automatic large pipeline cutting machine |
| CN207681625U (en) * | 2017-09-07 | 2018-08-03 | 上海交大海科检测技术有限公司 | The mud lower cutting device removed with Yu Haiyang abandoned well platform pipe |
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